Screw-stock and other cutting-tool provided with lubricating means.



J. F. HOLZSCHEITER.

SCREW STOCK AND OTHER CUTTING TOOL PROVIDED WITH LUBRICATING MEANS.

APPLICATION FILED NOV. 24. 1913.

1,173,516. Patented Feb. 29,1916.

THE COLUMBIA PLANOGRAPH c0., WASHINGTON, D. C

UNITED STATES PATENT OFFIC.

J'OHANN FRIEDRICH I-IOLZSCI-IEITER, F ZURICH, SWITZERLAND.

SCREW-STOCK AND OTHER CUTTING-TOOL PROVIDED WITH LUBRICAIING MEANS.

Specification of Letters Patent.

Patented Feb. 29, 191.

Original application filed December 14, 1912, Serial 110. 736,775. Divided and this application filed November 24, 1913. Serial No. 802,804. g

To all whom it may concern 7 I, J QHANN FRIEDRICH HoLzsoHEITER, a citizen of the Republic of Switzerland, residing at Zurich, in the Canton of Zurich, Republic of Switzerland, (whose post-office address is Manessestrasse 190, Zurich,) have invented certain new and useful Improvements in Screw-Stocks and other Cutting-Tools Provided with Lubricating Means, the subject thereof having been divided out from my patent application in the United States, No. 736,775, filed December 14, 1912; and I do hereby declare the following to be a full,- clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings and to letters of reference marked thereon, which form a part of this specification.

Ithas already been proposed to design anduse screw-stocks in which a lubricant is stored in a handle which is made hollow for this purpose, said lubricant being supplied to the cutting dies by means of a plunger adapted to-move axially in said hollow hanle. had the disadvantage that on the one hand the lubrication could not be effected without interrupting the work and on the other hand the stored up oil was completely wasted, if the workmen omitted to close the stopcock. Object of this invention is to provide an improved screw-stock, in which these draw- Be 't known that backs are absent.

Several forms of the improved screwstock constructed in accordance with this invention are illustrated by way of example in the accompanying drawings, in which :-v

Figure 1 is a section on the line A B of Fig. 5, showing a screw-stock provided with a ratchet mechanism and apart of the handle. Fig. 2is alongitudinal section through the hollow handle. Fig. 3 is a section on the line C D of Fig.2, Fig. 4 is a view of a detail of Fig. 5. Fig. 5 is a plan of the screwstock with the covering plate removed. Fig.

v6 is a plan view of details. Fig. 7 shows a plan of a modification. and Fig. Sshows a longitudinal section of it. 7

As shown 1 denotes a ring to which is secured an extension 3 bv means of screws, which extension is provided at its extremity are. Per-ease ear? 4 w ich i serew i The existing screw-stocks of this type the hollow shank or handle 5. 6 denotes a ratchet wheel which is revolubly mounted in the ring 1 and is provided on its periph cry with ratchet teeth 7. To the underside of the ratchet wheel there is screwed a plate 2. Two pawls 8 and 9 engage with the ratchet wheel, which pawls are adapted to turn about pins 10and 11 respectively fixed in the extension 3 and are subjected to the action of springs 13 and 14 respectively. These springs tend to hold the pawls in en-' gagement with the ratchet teeth. The short arms 15 and 16 respectively of the pawls 8 and 9 bear against a cam 17; when rotating the screw-stock by means of the handle or handles, no matter in which direction, the pawls when in the position shown drive the ratchet wheel. If, however, the cam 17 is turned through say to the right (Fig. 2) then the raised part of said cam causes the pawl 9 to disengage from the ratchet teeth, so that the ratchet wheel is only moved, if the handle is turned toward the left, whereas when turning it toward the right the upper pawl 8 simply clatters over the ratchet teeth without moving the ratchet wheel. This adjustment is suitable for cutting left hand threads in cases where there is not sufiicient room for continuously turning or revolving the screw-stock. If it is required to cut a right hand thread, then the cam 17 should be turned toward the left through an angle of about 45 by means of the handle 18 by which means the pawl 8 is caused to disengage from the ratchet wheel so that the latter will only be moved or driven when the handle of the screw-stock is turned to the right. I

A square opening 19 is provided in the ratchet wheel 6, in which opening there are arranged the four cutting dies. A long tube 20 is screwed on to the thread-ed part 4 of the extension 3 already referred to (Figs. 1, 2 and 6), the right hand end of which tube is closed by a nipple 21 of a roughened handle 22, which nipple is revolubly mounted in said end. In order to prevent a lateral displacement of the handle, a groove is provided in its nipple 21 in which groove two semicircular rings 220 are loosely mounted which are secured by means of screws 23 to the tube 20. The nipple 21 is provided with a female thread for a hollow screw spindle 24 which in its turn is provided at its front 'tool may be employed.

25. A plunger 26 closely fitting the bore of the tube 20 is fixed to the front end of said screw spindle 25. Two projections provided on said plunger and engaging with grooves provided in the tube 20 prevent the plunger from being turned when turning the handle 22 (Figs. 3 and 4). From the preceding it will be evidentthat when suitably turning the handle 22 in the corresponding direction, the plunger 26 will be moved toward the cutting dies.-' 3 I 7 'In a conical recess provided in the plate 2 there is arranged a plate or ring 27 which is provided with three radially extending passages 28 which open on the inside into the bore 29, the width of which is somewhat greater than the external diameter of the thread to be cut. The passages 30 form the continuation of three passages 31 provided in the lower covering plate 2. Said passages 31 emanate from a groove 32' provided in the ratchet wheel 6 which groove 32 through the intermediary of a passage 33 extending through the extension 3 is in communication with an opening 36 accommodating a valve 34. The opening 36 is closed at the top and at the bottom by a pin 37 and 38 respectively. A spring 39 which abuts at one end against the pin 38 normally presses the valve 34: on to its seat by which means the communication between the cavity in the tube 20 and the groove 32 is interrupted.

In order to provide an article, for instance, a tube with a thread the screw-stock is mounted in a known manner on the same. In order to insure a correct mounting of the screw-stock on the Work-piece special means for insuring a rectilinear guidance of the These means comprise a plate 10 in which there are arranged jaws which are smooth on theinside and which may be adjusted in accordance with the thickness of the work-piece in a known manner by turning a spindle 41. These plates or disks 40 may be secured by means of two bolts 42 and nuts 54 to the ratchet wheel 6. If these guiding means are not required, then the same may be removed from the screw-stock without diiiicultyby unscrewing the nuts.

When cutting a thread ample lubrication is required. The necessary lubricating oil is stored in the tube 22, the latter is filled, for instance as follows: After the removal of the pin 37, which normally closes the opening 36, oil is slowly poured into said opening and at the same time the handle 22 is so turned that the spindles 24 and 25 cause the plunger 26 tomove in an outward direction as far as possible. By this means the air within the tube 20 on the inside of the plunger is rarefied thus producing a partialvacuum so that the oil is sucked from the openingr36 throughthepassage 33 into the-tube20. litter the tube-:20has been filled orwhen the plunger 26 has arrived at its extreme position, the opening 36 is again closed by means of the pin 37. For

the purpose of effecting a lubrication the workman turns the handle 22 which may be done simultaneously with the turning of the screw-stock. On account of the resulting forward movement of the plunger 26, a definite quantity of oil is forced through the passage 33 into the opening 36 where the same, overcoming-the pressure exerted by'the spring 39, opens the valve 3land then flows through the passage33 to the groove 32. From this groove the oil passes through the passages 31 provided in the plate 2 into the passages 30 provided in the plate 27 and from there directly beneath the cutting dies or in other words the same is supplied to the work-piece at the points where the cutting takes place. As will be evident from the aforegoing the oilowing to the provision of the groove 32 may pass through the ratchet wheel to the place where the cutting is taking place no matter whether the screw-stock is used with or without the employment of the ratchet wheel. v Figs. 7 and 8 show an example of the screw-stock without a ratchet wheel. In this case the passage 33 emanating from the valve 34 opens into the passages 31 which are provided on, the inside of the lower covering plate 2. From the passages 31 the oil flows intothe passages 30 of the plate 27 and from there tothe work-piece. In both examples the plate 27 is interchangeably mountedin the plate 2. Preferably a separate plate 27 is kept in store for each different thread size which may be required to becut.

. WVhat I claim is I 1. In a screw-stock the combination of a holder for the cutting dies, an annular disk covering the cutting dies, a conical seat provided in said disk, a disk arranged in the conical seat, the mentioned disks being traversed by lubricating passagesemanating from an annular groove and extending toward the work-piece.

, 2. In a screw-stock the combination'of a holder for the cutting dies, an annular disk covering the cutting dies, a conical seat provided in said disk, a disk arranged in the conical seat, the mentioned disks beingprovided with lubricating passages emanating from an annular groove and extending toward the work-piece, handles secured to the holder of which one is made hollow and serves for storing oil, and a passage extending from the cavity of the handle to the annular. groove.

3. In a screw stock the combination of a holder for the cutting dies, handles secured to the holder, one of the handles having a partwhich is made hollow and serves for storing oil and another part forming the In testimony whereof, I have signed my rectilinear continuation of the hollow part name to this specification in the presence of and being revolubly mounted in the latter, two subscribing witnesses.

an annular groove in said screw stock and JOHANN FRIEDRICH HOLZSGHEITER.

a passage emanating from the cavity of the Witnesses:

hollow part of the handle to the annular HERMANN HUBER,

groove. CARL CUBLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

